either option will work and both will require down time while your phones upgrade to the newest phone load. if you have a cluster I would take the publisher off-line and upgrade a subscriber as a new publisher and roll the phones to the new server then rebuild the other subscribers wth the new platform. after the transition is complete and you are happy with the results I would move the old publisher over as a new subscriber.

Featured Post

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention. Check out this how-to article for more information.

Ever wanted to query Cisco Call Manager CDR records from MS SQL Server? Here's how!
CUCM can be configured to upload a CDR file to a given FTP server every minute. This article will show you how to set this up, schedule the import of this data an…

I recently purchased a Bluetooth headset called the Music Jogger (model BSH10). The control buttons on it look like this:
One of my goals is to use it as the microphone and speakers for Skype calls. In that respect, it works well. However, I …

Are you ready to place your question in front of subject-matter experts for more timely responses? With the release of Priority Question, Premium Members, Team Accounts and Qualified Experts can now identify the emergent level of their issue, signal…

Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day.
…